Parameterization With The Wizard - Siemens SIMATIC S7 Manual

Connection
Parameters
Modbus
Parameters
Alternatives for
Parameterization
4.1

Parameterization with the Wizard

General
Information
.
MODBUS / TCP communication via the integrated PN interface of the CPU
2XV9450-1MB02; Manual edition 2.1
The parameters of the connection are defined in the first block, e.g. the used
local interface and the IP address of the communication partner. The
functions TCON and TDISCON can establish and terminate a connection by
means of these parameters. A detailed structure can be found in section 4.2.
The structure of the connection parameter block is obligatory und may not be
changed. Otherwise it becomes impossible to set up a connection.
The Modbus parameters define the mode of communication and the address
reference, e.g. how many register or bit areas are mapped to which DB or the
differentiation between the S7 acting as server or as client. The structure of
the parameter DB has to remain unchanged to ensure proper communication.
There are two alternatives for a parameterization of the connection and
Modbus parameters. The first one is to use a Wizard, which offers an easy
way to setup the connection parameters. The second possibility is to edit the
parameters in the structure in the data block with the editor of STEP7.
The two opportunities are described in detail in the following sections 4.1 and
4.2.
With the wizard Modbus TCP Wizard you can easily parameterize the
connection parameters as well as the Modbus parameters in the parameter
data block MODBUS_PARAM. The complete structure (connection
parameters and Modbus parameters) is created.
It is recommended to use the wizard for the parameterization of the block
MODBUS_PARAM.
You can find the wizard at
http://support.automation.siemens.com/WW/view/en/31535566.
Parameterisation of the Modbus Communication
4-2